The Aeronaut from Tom Bihn is an excellent duffel/backpack conversion bag with minimal organization and insanely durable materials and construction. view bag
The Black Hole Duffel from Patagonia is a classic. Solidly built. Fairly affordable. Zero gimmicks. view bag
The Viken from YNOT is as simple and sturdy a duffel as a modern urbanite could ask for. And it expands. Just lovely. view bag
Well designed simplicity
Burly. Compartmentalized.
Organized. Spacious.
Affordable Killer.
The Laid-Back Lifer
Solid. Organized. Techy.
Clean. Bento Boxy.
Light. Tough.